After a 29-day interruption to repair a leak in Kansas, oil flows resumed Thursday to all destinations on Keystone Pipeline for up to 600,000 b/d of Canadian exports into the United States.

TC Energy Corp. said added precautions enabled the restart, including a reduction to a high operating pressure previously allowed by a special permit from the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA).

“After completing repairs, inspections and testing we proceeded with a controlled restart of the Cushing Extension,” said TC management. “The Keystone Pipeline System is now operational to all delivery points.

“The pipeline system will operate with additional risk-mitigation measures, including reduced operating pressures. We maintain our commitment to our...